One sparrow, two trophic levels
"One sparrow, two trophic levels" is a free, interactive Class 12 Biology simulation for NEET, built on the NCERT section "Limits of trophic levels and pyramids" in Ecosystem. A trophic level is a role, not a species: a sparrow's diet mix splits it across levels 2 and 3. NEET has asked about this idea 2 times in 10 years of papers.
From the lesson Limits of trophic levels and pyramids in Ecosystem. Change the values and watch what happens.
What it shows
NCERT §12.5
A trophic level is a role, not a species: a sparrow's diet mix splits it across levels 2 and 3.
Controls
3 to try
- Slidersparrow diet seeds vs insects 0–100%
- Tapadd/remove links in a small food web
- Readoutshare of sparrow energy at each trophic level
Try this
Set the sparrow's diet so it is a primary and a secondary consumer at the same time, then find which pyramid bar it belongs to.
Common mistake
Assigning each species one fixed trophic level.
In NEET
10 years of papers
Asked 2 times in 10 years of NEET.
See the past questions: Energy Flow in Ecosystem, Ecosystem (chapter)
The idea behind it
NCERT §12.5
- Any calculation of energy, biomass or number must include all the organisms at a trophic level; a few individuals cannot support a generalisation.
- A trophic level describes a role, not a species. A single species can work at two or more trophic levels in one ecosystem at once.
- Feeding on seeds, fruits and peas, a sparrow acts as a primary consumer; feeding on insects and worms, it acts as a secondary consumer.
- Ecological pyramids do not account for a species that belongs to two or more trophic levels.
- They assume a simple food chain, which almost never exists in nature, and cannot show a food web.
- Saprophytes are left out of ecological pyramids altogether, despite their vital role in the ecosystem.
Questions
4 answers
- What does the "One sparrow, two trophic levels" simulation show?
- A trophic level is a role, not a species: a sparrow's diet mix splits it across levels 2 and 3.
- What mistake does the "One sparrow, two trophic levels" simulation fix?
- A common mistake it clears up: assigning each species one fixed trophic level.
- Has NEET asked about this idea?
- Yes. NEET has asked about this idea 2 times in 10 years of papers.
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Limits of trophic levels and pyramids" in Ecosystem (Class 12 Biology).
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